AMENDED AND RESTATED

CERTIFICATE OF INCORPORATION

OF

ALTRA INDUSTRIAL MOTION CORP.

FIRST: The name of the corporation (which is hereinafter referred to as the “Corporation”) is Altra Industrial Motion Corp.

SECOND: The address of the Corporation’s registered office in the State of Delaware is Corporation Service Company, 251 Little Falls Drive in the City of Wilmington, County of New Castle, Delaware 19808. The name of the Corporation’s registered agent at such address is Corporation Service Company.

THIRD: The purpose of the Corporation is to engage in any lawful act or activity for which corporations may be organized under the General Corporation Law of the State of Delaware (the “DGCL”).

FOURTH: The total number of shares of stock which the Corporation shall have authority to issue is 1,000, consisting entirely of common stock, having a par value of $0.01 per share.

FIFTH: In furtherance and not in limitation of the powers conferred by statute, the board of directors of the Corporation (the “Board of Directors”) is expressly authorized to make, alter or repeal the Bylaws of the Corporation.

SIXTH: The number of directors of the Corporation shall be fixed from time to time by the Bylaws of the Corporation. Election of directors need not be by written ballot unless the Bylaws of the Corporation so provide.

SEVENTH: A director or officer of the Corporation shall not be liable to the Corporation or its stockholders for monetary damages for breach of fiduciary duty as a director or officer, respectively, except to the extent such exemption from liability or limitation thereof is not permitted under the DGCL as the same exists or may hereafter be amended. For the purposes of this Article SEVENTH, “director” and “officer” shall have the meanings provided in Section 102(b)(7) of the DGCL, as it presently exists or may hereafter be amended from time to time. If the DGCL is amended after the effective date of this certificate to authorize corporate action further eliminating or limiting the personal liability of directors or officers, then the liability of a director or officer of the Corporation shall be eliminated or limited to the fullest extent permitted by the DGCL, as so amended.

EIGHTH: To the fullest extent permitted under the DGCL, the Corporation shall provide indemnification of (and advancement of expenses to) any person who was, is or is threatened to be made a party to a proceeding by reason of the fact that he or she (i) is or was a director or officer of the Corporation or (ii) while a director or officer of the Corporation, is or was serving at the request of the Corporation as a director or officer (or similar role) of another foreign or domestic corporation, partnership, joint venture, sole proprietorship, trust, employee benefit plan, or other enterprise. Such right shall be a contract right and as such shall run to the benefit of any director or officer who is elected and accepts the position of director or officer of the Corporation or elects to continue to serve as director or officer of the Corporation while this Article EIGHTH is in effect. Any repeal or amendment of this Article EIGHTH shall be prospective only and shall not limit the rights of any such director or officer or the obligations of the Corporation with respect to any claim arising from or related to the services of such director or officer in any of the foregoing

capacities prior to any such repeal or amendment to this Article EIGHTH. Such right shall include the right to be paid by the Corporation expenses incurred in defending any such proceeding in advance of its final disposition to the maximum extent permitted under the DGCL. If a claim for indemnification or advance of expenses hereunder is not paid in full by the Corporation within sixty (60) days after a written claim has been received by the Corporation, the claimant may at any time thereafter bring suit against the Corporation to recover the unpaid amount of the claim, and if successful in whole or in part, the claimant shall also be entitled to be paid the expenses of prosecuting such claim. It shall be a defense to any such action that such indemnification or advancement of costs of defense are not permitted under the DGCL, but the burden of proving such defense shall be on the Corporation. Neither the failure of the Corporation (including the Board of Directors or any committee thereof, independent legal counsel, or stockholders) to have made its determination prior to the commencement of such action that indemnification of, or advancement of costs of defense to, the claimant is permissible in the circumstances nor an actual determination by the Corporation (including the Board of Directors or any committee thereof, independent legal counsel, or stockholders) that such indemnification or advancement is not permissible shall be a defense to the action or create a presumption that such indemnification or advancement is not permissible. In the event of the death of any person having a right of indemnification under the foregoing provisions, such right shall inure to the benefit of his or her heirs, executors, administrators, and personal representatives. The rights conferred above shall not be exclusive of any other right which any person may have or hereafter acquire under any statute, bylaw, resolution of stockholders or directors, agreement, or otherwise. As used herein, the term “proceeding” means any threatened, pending, or completed action, suit, or proceeding, whether civil, criminal, administrative, arbitrative, or investigative, any appeal in such an action, suit, or proceeding, and any inquiry or investigation that could lead to such an action, suit, or proceeding.

NINTH: The Corporation reserves the right to amend, alter, change or repeal any provision contained in this Certificate of Incorporation, in the manner now or hereafter prescribed by statute, and all rights conferred upon the stockholders herein are granted subject to this reservation; provided, however, that any amendment, repeal or modification of any of the provisions of Article SEVENTH or EIGHTH shall not adversely affect any right or protection of a director, officer, agent, or other person existing at the time of, or increase the liability of any such person with respect to any acts or omissions occurring prior to, such amendment, repeal or modification.

[Remainder of page intentionally left blank.]